Stratigraphy and chronology of Late Wisconsinan glacial deposits, south-central Indiana - Coalition 2017

Status Start Date End Date Locations
completed Sep 1, 2017 Aug 31, 2018 Bartholomew, Hendricks, Johnson, Marion, Morgan
Director: Henry Loope
Other Researchers: Jose Luis Antinao, Matthew Johnson, Drew Packman, Robin Rupp Thomas Lowell, University of Cincinnati Brandon Curry, Illinois State Geological Survey David Grimley, Illinois State Geological Survey
Funding: U.S. Geological Survey (USGS) - Great Lakes Geologic Mapping Coalition
Issue: This project stems from a need in Indiana to revisit the litho- and chronostratigraphic framework for Quaternary sediments described by Wayne (1963) and to build on the glacial terrain and sequence approach (Brown and Fleming, 2003) near the maximum limit of Wisconsinan glaciation. Developing this framework is important for evaluating groundwater resources in Wisconsinan-age glacial sediments.
Objective: The goal is to document the chronology and stratigraphy of late Wisconsinan glacial sediments in south-central Indiana and build a 3-D geological model of unconsolidated sediments for the region.
Approach: Both outcrops and cores will be used to collect chronologic and stratigraphic data. The project will use radiocarbon dating of macrofossils and gastropods, as well as optically stimulated luminescence dating of quartz sand, to obtain chronology. Hollow stem augering (split-spoon samping), direct-push GeoProbe coring, wireline coring, and/or rotosonic coring will be used to collect continuous core. These data will be integrated into boreholes already collected from prior mapping efforts in south-central Indiana from the STATEMAP and Coalition programs.
Products: An IGS Open File Report containing data (e.g., radiocarbon ages, OSL ages, particle size, clay mineralogy) of the outcrops and cores collected will be produced in 2018. The data will subsequently be incorporated into a manuscript for journal publication.
Benefits: Enhances our understanding of the glacial stratigraphy of south-central Indiana. Glacial stratigraphic data can be used to evaluate groundwater resources (quantity and quality) in an area with a growing population and associated industry.